JP3435615B2 - Electrostatic latent image developing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic latent image developing apparatus used for developing an electrostatic latent image into a toner image in an image forming machine such as an electrostatic copying machine or a laser printer, and more specifically, An electrostatic device having a developing roller that holds the developer on the surface and conveys it to the developing area, and a regulating member that includes a rigid member that acts on the surface of the developing roller and regulates the amount of the developer retained on the surface. The present invention relates to a latent image developing device.

[0002]

2. Description of the Related Art As is well known, in order to develop an electrostatic latent image into a toner image in an image generator, an electrostatic latent image developing device having a developing roller that is rotationally driven in a predetermined direction is widely used. Have been served. When the developing roller is driven to rotate in a predetermined direction, the developer holding area, the developer amount regulating area, and the developing area can be sequentially moved. In the developer holding region, toner as a developer supplied by an appropriate mode is held on the surface of the developing roller. In the developer amount regulation area, the regulation means acts on the toner as the developer retained on the surface of the developing roller to regulate the toner retained on the surface of the developing roller to a required amount. In the developing area, toner as a developer is applied to the surface of an electrostatic latent image bearing member such as a rotating drum having an electrophotographic photosensitive layer on the peripheral surface to form a toner on the surface of the electrostatic latent image bearing member. The electrostatic latent image is developed into a toner image. In order to achieve good development, the amount of toner retained on the surface of the developing roller is appropriately regulated by the regulating means so that the toner layer retained on the surface of the developing roller has a predetermined thickness and an axial direction. It is important to form the film sufficiently uniformly.

Japanese Patent Publication No. 63-16736 discloses an electrostatic latent image developing device provided with a regulating means having a blade made of a rubber elastic body made of synthetic rubber such as urethane rubber and silicon rubber. The rubber elastic body constituting the developer regulating means has one surface or the leading edge thereof pressed against the surface of the developing roller to regulate the amount of toner held on the surface of the developing roller to a considerably small amount, and the toner on the surface of the developing roller. To form a thin layer of. Further, a blade of the developer regulating means is constituted by a stainless steel thin plate for spring having a thickness of 0.1 to 0.2 mm, which has been put into practical use. However, in the developer regulating means using an elastic blade such as a rubber elastic body or a stainless thin plate, both ends of the elastic blade are low in rigidity and inferior in regulation force to the central portion, so that they are formed on the surface of the developing roller. The toner layer at both ends is thicker at both ends than the center portion. According to the experiments by the present inventors, when the urethane blade is used, the toner layer at both ends is 3.5 times thicker than the center portion.
It was found that the thickness was about 7.0 μm. As described above, when the elastic blade is used, it is difficult to form the toner layer formed on the surface of the developing roller to have a uniform thickness in the entire axial direction, and thus it is difficult to obtain a uniform image. In addition, the elastic blade has low wear resistance and is not always satisfactory in terms of prolonging its service life.

In order to solve the above problems of the elastic blade, the applicant of the present invention has proposed an invention in which the blade constituting the developer regulating means is formed of a rigid member such as glass.
Proposed as No. 36277. By forming the blade from plate glass, the layer thickness of the toner layer formed on the surface of the developing roller can be uniformly controlled in the width direction, and abrasion resistance is also improved, which is also satisfactory in terms of long life. It became possible.

[0005]

Therefore, in a blade supporting structure composed of a rigid member, the upper end of the blade (B) is brought into contact with the holder (H) as shown in FIG. If the blade has a considerable thickness, it is abutted against the holder (H) by surface contact. However, when the developing roller (R) rotates in the direction of the arrow and receives the force of (F) due to the frictional force, the frictional force of the contact surface between the upper end surface of the blade (B) and the holder (H) is large, Due to the pressing force of the pressing spring (S), the pressure contact force (P) of one side of the blade (B) acting on the peripheral surface of the developing roller (R) becomes unstable.

The present invention has been made in view of the above facts, and its main technical problem is to reduce the frictional force between the upper end surface of the blade and the contact surface between the holder and the pressing force of the pressing spring. It is an object of the present invention to provide an electrostatic latent image developing device in which one surface of a blade constantly and stably maintains a pressure contact force acting on a peripheral surface of a developing roller.

[0007]

In order to solve the above-mentioned main technical problems, according to the present invention, a developing housing,
A developing roller for holding the developer on the surface in the developer holding area and conveying the held developer to the developing area and applying it to the electrostatic latent image; and the developer holding area. In an electrostatic latent image developing device, a regulating means is provided which regulates the amount of the developer retained on the surface of the developing roller in the developer regulating area located between the developing area and the developing roller. Is a blade made of a rigid member, one surface of which is pressed against the surface of the developing roller, a support member which is mounted on the upper end of the blade and has both ends of the upper end brought into line contact with the holder, and one surface of the blade. And an elastic urging means for pressing the developing roller in a direction in which the developing roller is pressed against the surface of the developing roller.

Further, according to the present invention, the developing housing and the developer holding area disposed in the developing housing holds the developer on the surface thereof and conveys the held developer to the developing area to electrostatic latent image. A developing roller for applying an image, and a regulation that acts on the surface of the developing roller in a developer regulating area located between the developer retaining area and the developing area to regulate the amount of the developer retained on the surface. In the electrostatic latent image developing device, the restricting means includes a blade made of a rigid member, one surface of which is pressed against the surface of the developing roller, and the upper end of the blade is attached to the holder at both ends. A support member that is brought into contact with the elastic member, and an elastic urging means that presses one surface of the blade in a direction in which the surface of the developing roller is pressed.
An electrostatic latent image developing device is provided, which has an elastic member interposed between a surface of the support member on the pressing direction side by the elastic biasing means and a holder.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the electrostatic latent image developing device constructed according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an image generator equipped with an electrostatic latent image developing device constructed according to the present invention. The illustrated image generator includes a rotary drum 1 as an image carrier having a photosensitive layer on its peripheral surface. The rotary drum 1 is rotatably mounted in a machine body housing (not shown) by a rotary shaft 2. Around the rotating drum 1 which is rotated in the direction indicated by the arrow 3, a charging corona discharger 4 for sequentially charging the photosensitive layer of the rotating drum 1 to a specific polarity in the direction of rotation, and the charging corona discharger. A laser optical device 5 as an exposing means for forming an electrostatic latent image on the photosensitive layer of the rotary drum 1 which is charged with a specific polarity by an electrostatic latent image formed by the laser light emitted from the optical device 5. An electrostatic latent image developing device 6 for developing a toner image, a transfer corona discharger 7, a peeling corona discharger 8, a cleaning device 9, and a charge eliminating lamp 10 are provided.

The developing device 6 is provided with a developing housing 12 which can be formed of synthetic resin. Inside the developing housing 12, a developing roller 16, a supplying means 18, an agitating means 20 and a regulating means 22 are provided. It is arranged. Further, although not shown, a toner cartridge containing toner is mounted on the developing housing 12.

The developing roller 16 is the developing housing 1 described above.
It includes a rotary shaft 24 rotatably mounted between the two side walls and a roller 26 fixed to the rotary shaft 24.
The rotating shaft 24 can be formed of a suitable metal material such as stainless steel. The roller 26 is made of a relatively soft and conductive material, for example, a conductive solid rubber such as urethane rubber. The roller 26 has an Asker C hardness of 60 to 85 in the illustrated embodiment.
The volume resistance of the roller 26 is set to about 10 ^{6 to} 10 ⁹ Ω · cm. The roller 26 of the developing roller 16 configured as described above is exposed through an opening formed in the developing housing 12 and is positioned to face the rotary drum 1. The peripheral surface of the roller 26 that constitutes the developing roller 16 is
It is pressed against the peripheral surface of the rotary drum 1, and the peripheral surface of the roller 26 is slightly elastically compressed in the pressed region. The rotating shaft 24 of the developing roller 16 is continuously driven to rotate in a direction indicated by an arrow 28 in FIG. By the above rotation of the rotary shaft 24, the roller 26 is also continuously driven to rotate in the direction indicated by the arrow 28, and the peripheral surface of the roller 26 is sequentially conveyed through the developer holding area 30, the developer regulating area 32 and the developing area 34. It

The supply means 18 includes a rotating shaft 36 rotatably mounted between both side walls of the developing housing 12.
An auxiliary roller 38 fixed to the rotating shaft 36 is included. The auxiliary roller 38 is made of a foam material such as foam silicon or foam urethane. The auxiliary roller 38 is pressed against the roller 26 of the developing roller 16. The hardness of the foam forming the auxiliary roller 38 is considerably smaller than the hardness of the roller 26 (for example, the Asker C hardness is about 35), and the auxiliary roller 38 is pressed against the roller 26, so that the auxiliary roller 38 becomes 0 It is desirable to be elastically compressed by about 0.15 to 0.25 mm. This auxiliary roller 38 is continuously driven to rotate in the direction indicated by arrow 39 in FIG. The stirring means 20 is the developing housing 12
1 includes a rotating shaft 40 rotatably mounted between both side walls (not shown) and an agitating member 42 fixed to the rotating shaft 40.
It is driven to rotate continuously in the direction indicated by 4.

Next, the regulating means 22 will be described with reference to FIG. The regulating means 22 is the developing roller 1
6, a blade 46 made of a rigid member that is pressed against the peripheral surface of the roller 26, and a support member 47 for the blade 46.
And an elastic urging means 48 for pressing one surface of the blade 46 in a direction of pressing against the peripheral surface of the roller 26, and a holder 49 for holding the blade 46, the supporting member 47 and the elastic urging means 48. There is.

The holder 49 is formed by extruding an aluminum alloy, for example. This holder 49
Has a length in the width direction corresponding to both side walls of the developing housing 12, and is provided with a supporting recess 491a which fits the upper end of the supporting member 47 and abuts the upper end thereof.
91 and a supporting portion 49 for supporting the lower end of the blade 46.
Lower wall 492 with 2a, said upper wall 491 and lower wall 49
2 and an intermediate wall 493 connecting the two. The upper wall 491 and the lower wall 492 constituting the holder 49 are formed with screw holes 491b and 492b at both ends thereof, and the holder 49 thus constructed is shown between both side walls of the developing housing 12. Of the screw holes 491b and 4 which are provided at predetermined positions in FIG.
Development housing 1 by being screwed onto 92b
It is attached to 2.

At least one surface (that is, the surface pressed against the peripheral surface of the roller 26) of the blade 46 made of the above-mentioned rigid member extends along the peripheral surface of the roller 26 in the width direction (direction perpendicular to the paper surface in FIG. 1). It is composed of a plate-like member that is a flat surface that extends. The surface roughness of at least a region of the one side of the blade 46 which is pressed against the peripheral surface of the roller 26 is sufficiently small, and the center line average roughness Ra defined in JIS B 0601 is 6.00 or less, particularly 0.2.
It is preferably 0 or less, and particularly preferably 0.02 or less. If the surface roughness of the one surface of the blade 46 becomes excessive, the surface of the toner layer formed on the peripheral surface of the roller 26 constituting the developing roller 16 is not sufficiently flattened and tends to be non-uniform. There is. Therefore, a commercially available sheet glass is used as a suitable rigid material having a sufficiently small surface roughness and high hardness and abrasion resistance even though the blade 46 can be formed relatively inexpensively. Can be mentioned. The plate glass may have a thickness of about 3 mm. If it is desired to apply the required voltage to the blade 46 to control the charging characteristics of the toner, a conductive coating can be applied to one side of the sheet glass. As a plate glass with a conductive coating on one side, the trade name is "Nesa glass"
The glazing marketed as is may conveniently be used. Instead of the plate glass, the blade 46 may be made of a rigid member made of an appropriate metal plate such as stainless steel. In order to sufficiently reduce the surface roughness of one surface of the metal plate that constitutes the blade 46, one surface of the metal plate can be subjected to appropriate surface treatment, if necessary. If desired, the blade 46 may be constructed from a laminate of sheet glass and metal sheet,
One surface of the developing roller 16 which is brought into pressure contact with the roller 26 can be defined by the exposed surface of the plate glass. The blade 46 thus configured has its lower end placed on the supporting portion 492a of the lower wall 492 which constitutes the holder 49, and one surface thereof is brought into contact with the peripheral surface of the roller 26.

The support member 47 is made of a thin steel plate in the illustrated embodiment. The supporting member 47 has a length substantially corresponding to the length of the blade 46 in the width direction, and is fixed to the upper end of one surface of the blade 46 by a fixing means such as an adhesive. When it is desired to apply a required voltage to the blade 46 in order to control the charging characteristics of the toner, a conductive adhesive is used as the fixing means, so that the blade 46 can be supported via the support member 47. A voltage can be applied. In this way, the support member 4 fixed to the upper end of one side of the blade 46
7 is projected from the upper end of the blade 46, and its upper end is a supporting recess 49 formed in the upper wall 491 of the holder 49.
It is adapted to come into contact with the upper surface 491c of 1a. In addition, in the embodiment shown in FIG. 2, the protrusions 471, 471 are formed at both ends of the upper end of the support member 47, and therefore, only the upper ends of the protrusions 471, 471 are held by the holder 4.
The upper surface 4 of the support recess 491a formed in the upper wall 491 of
Abut on 91c. As described above, since the support member 47 shown in FIGS. 1 and 2 is made of a thin steel plate, the area of the upper end surface thereof is extremely small, and therefore the support recess 491a formed in the upper wall 491 of the holder 49 is formed. Since it comes into line contact with the upper surface 491c, the holder 49
It is possible to reduce the frictional force due to the contact with. In particular, the support member 47 shown in FIG.
471 is formed, and only the upper ends of the protrusions 471, 471 are formed in the upper wall 491 of the holder 49.
Since it is configured to come into contact with the upper surface 491c of 1a, the frictional force due to the contact with the holder 49 is further reduced.

FIG. 3 shows another embodiment of the support member 47. In this embodiment, the support member 47
Consists of two support blocks 472, 472 mounted on the upper end of the blade 46. The support blocks 472 and 472 are each provided with a fitting recess 472a into which the upper end of the blade 46 is fitted, and the upper end thereof has a ridge line 472c formed by two inclined surfaces 472b and 472b. Therefore, this ridge line 472c is the holder 49
It comes into line contact with.

FIG. 4 shows still another embodiment of the support member 47. Also in this embodiment, the support member 47 is composed of two support blocks 473 and 473 mounted on the upper end of the blade 46. Each of the support blocks 473 and 473 is provided with a fitting recess 473a into which the upper end of the blade 46 is fitted, and the upper end thereof is formed by an arc surface 473b. Therefore, the arcuate surface 473b comes into line contact with the holder 49.

The elastic biasing means 48 includes a pressing member 481 that abuts against the other surface of the blade 46, and a plurality of pressing members 481 that press one surface of the blade 46 in a direction of pressing the peripheral surface of the roller 26 through the pressing member 481. The compression coil spring 482 is provided. The pressing member 481 is made of, for example, a stainless steel plate, has a length substantially equal to that of the blade 46 corresponding to the width direction length of the blade 46, and has eight spring supporting protrusions 481a on the back surface in the width direction. Is attached. The plurality (6 in the illustrated embodiment)
One) of the compression coil springs 482 has one end portion attached to the back surface of the pressing member 471.
a and the other end is the intermediate wall 4 of the holder 49.
It is provided so as to penetrate through a hole 493a formed in 93. Then, the back plate 49 is provided on the back surface of the intermediate wall 493.
By mounting No. 5, the compression coil spring 482 presses one side of the blade 46 in the direction of pressing against the peripheral surface of the roller 26 via the pressing member 481. Developing roller 16
The pressing force of the blade 46 against the peripheral surface of the roller 26 can be appropriately set according to the thickness of the toner layer to be formed on the peripheral surface of the roller 26. When the pressure contact force increases, the thickness of the developer layer formed on the peripheral surface of the roller 26 decreases. On the other hand, if the pressure contact force becomes too large,
The smooth rotation of the roller 26 tends to be hindered.
In the developing mode in the illustrated embodiment, the thickness of the toner layer formed on the peripheral surface of the roller 26 is usually about 20 to 30 μm, and in order to properly form the developer layer having such a thickness. Is a linear pressure (pressure per unit length in the width direction) of the blade 46 against the circumferential surface of the roller 26.
It suffices to press-connect at 90 to 90 g / cm.

When the roller 26 rotates in the direction indicated by the arrow 28 with one surface of the blade 46 pressed against the peripheral surface of the roller 26 of the developing roller 16 by the elastic urging means 48 as described above, the blade 46 will be rotated. The force of (F) is pressed in the direction of the arrow by the frictional force, and the upper end of the support member 47 mounted on the upper end of the blade 46 is attached to the holder 49.
Upper surface 49 of support recess 491a formed in upper wall 491 of
It is brought into contact with 1c. Thus, in the state where the upper end of the support member 47 is brought into contact with the holder 49,
The lower end portion of the blade 46 is provided with the roller 26 and the blade 4.
It is desirable that the roller 26 is projected to the upstream side to some extent beyond the pressure contact portion 6 when viewed in the moving direction of the roller 26. The protruding length of the lower end portion of the blade 46 (that is, the length from the contact center between the roller 26 and the blade 46 to the lower end of the blade 46) is generally 0.5 to 4.0 mm, particularly 0.8.
It is preferably from 3.5 to 3.5 mm, particularly from 1.0 to 2.0 mm. If the protruding length is excessively short and becomes substantially zero, the restricting action of the blade 46 becomes excessive and it tends to be difficult to form a good developer layer, and if the protruding length becomes excessively long. The thickness of the formed developer layer tends to be too large, and the charge amount of the toner tends to be too small.

The electrostatic latent image developing device according to the embodiment shown in FIGS. 1 to 4 is configured as described above, and its operation will be described below. When the operation of the electrostatic latent image developing device is started, the roller 26 of the developing roller 16, the auxiliary roller 38 of the supplying means 18, and the stirring means 20 are rotationally driven in directions indicated by arrows by driving means not shown. The roller 26 of the developing roller 16 is continuously driven to rotate in the direction indicated by the arrow 28, and the supplying means 18 is provided in the developer holding area 30.
Acts on the roller 26 to separate the toner held on the peripheral surface of the roller 26 until then from the roller 26, and the toner is newly supplied to the peripheral surface of the roller 26. In the developer regulation area 32, the blade 46 of the regulation means 22 acts on the developer retained on the peripheral surface of the roller 26 to regulate the toner retained on the peripheral surface of the roller 26 to a required amount and reduce the toner. Form in layers. The roller 2
In order to make the thickness of the toner layer formed on the peripheral surface of No. 6 a predetermined amount, it is important that the pressing force of the blade 46 on the peripheral surface of the roller 26 by the elastic biasing means 48 is stable. However, in the illustrated embodiment, the roller 26 is pressed with one surface of the blade 46 pressed against the peripheral surface of the roller 26 of the developing roller 16 by the elastic biasing means 48.
The blade 46 is pressed by the force (F) in the direction of the arrow by the frictional force caused by the rotation of the blade in the direction indicated by the arrow 28, and the upper end of the support member 47 attached to the upper end of the blade 46 is the upper wall of the holder 49. Support recess 491a formed in 491
The support member 4 is abutted against the upper surface 491c of the
Since 7 is in line contact with each other, its frictional force is small.
The pressure contact force to the peripheral surface can be stabilized. Therefore,
The thickness of the toner layer formed on the peripheral surface of the roller 26 can be made uniform. Next, in the developing area 34, a developer is applied to the electrostatic latent image on the electrostatic photoconductor disposed on the peripheral surface of the rotary drum 1 to develop the electrostatic latent image into a toner image. . For example, the electrostatic latent image has a non-image area charged to about + 700V and an image area charged to about + 120V, and toner is attached to the image area (so-called reversal development). The rotary drum 1 is continuously driven to rotate in a direction indicated by an arrow 3 in FIG.
4, the peripheral surface of the rotary drum 1 and the peripheral surface of the roller 26 of the developing roller 16 are moved in the same direction. The moving speed V2 of the peripheral surface of the roller 26 is set to be slightly higher than the moving speed V1 of the peripheral surface of the rotating drum 1.
It is preferable that 1.2V1 ≦ V2 ≦ 2.2V1.
In this case, sufficient toner is conveyed to the developing area 34 by the roller 26, and the toner is once attached to the non-image portion of the electrostatic latent image by the sliding action of the peripheral surface of the roller 26 against the peripheral surface of the rotary drum 1. The toner is properly peeled off, and thus a good toner image having an appropriate development density and no fog can be obtained. As the developer, the volume average particle size (Vol. 50%: the toner having the volume average particle size or less and the toner having the volume average particle size or more have the same volume) is 8.
0 to 12.0 μm and volume resistance of 108 Ω ・
A developer consisting only of toner having a size of not less than cm is preferably used.

Next, another embodiment shown in FIG. 5 will be described. In this embodiment, the upper surface of the upper end portion (the surface on the pressing direction side by the elastic biasing means 48) of the supporting member 47 mounted on the blade 46 in the electrostatic latent image developing device shown in FIG. An elastic member 50 such as urethane foam is disposed between the front contact support surface 491d of the support recess 491a formed in the wall 491. In the illustrated embodiment, the elastic member 50 is attached to the front surface of the upper end portion of the support member 47 with an adhesive. In the type in which the front surface of the upper end of the support member 47 mounted on the blade 46 is brought into contact with the front contact support surface 491d of the support recess 491a formed in the upper wall 491 of the holder 49 to regulate the position, the front contact support described above is used. If the surface precision of the surface 491d and the precision such as the parallelism with the developing roller 16 are not achieved at a high level, the pressing force of the blade 46 against the peripheral surface of the roller 26 by the elastic biasing means 48 is not uniform. However, in the embodiment shown in FIG. 5, the elastic member 50 is disposed between the front surface of the upper end of the support member 47 and the front contact support surface 491d of the support recess 491a formed in the upper wall 491 of the holder 49. Even if there is a manufacturing error in the flatness and parallelism, the elastic member 50 can absorb the error. Therefore,
It is possible to improve the manufacturing accuracy of the holder 49 and each component, and to uniformize the pressure contact force of the blade 46 with the peripheral surface of the roller 26 by the elastic biasing means 48 without unnecessarily increasing the cost.

[0024]

In the electrostatic latent image developing device according to the present invention, the regulating means that acts on the surface of the developing roller and regulates the amount of the developer retained on the surface has rigidity such that one surface is pressed against the surface of the developing roller. A blade made of a member, a support member attached to the upper end of the blade and having both ends of the upper end brought into line contact with the holder, and elasticity for pressing one surface of the blade in a direction of pressing against the surface of the developing roller. Urging means, and when the frictional force acts by the rotation of the developing roller with one surface of the blade pressed against the peripheral surface of the developing roller by the elastic urging means, both ends of the upper end of the supporting member Since the part comes into line contact with the holder,
Since the frictional force is small, it is possible to stabilize the pressure contact force of the blade against the roller peripheral surface by the elastic biasing means.
Therefore, the thickness of the toner layer formed on the peripheral surface of the roller can be made uniform.

The electrostatic latent image developing device according to the present invention is
Since the elastic member is interposed between the surface of the supporting member on the pressing direction side by the elastic biasing means and the holder, even if there is an error in manufacturing the supporting member, the holder, the developing roller, or the like, this error is eliminated. It can be absorbed by the elastic member. Therefore, it is possible to increase the manufacturing accuracy of each component such as the holder, and to make the pressure contact force of the blade to the roller peripheral surface by the elastic biasing means uniform without unnecessarily increasing the cost.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an image generator equipped with an electrostatic latent image developing device configured according to the present invention.

FIG. 2 is a perspective view showing an embodiment of a supporting member which constitutes a regulating means provided in the electrostatic latent image developing device shown in FIG.

FIG. 3 is a perspective view showing another embodiment of a supporting member which constitutes a regulating means provided in the electrostatic latent image developing device shown in FIG.

FIG. 4 is a perspective view showing still another embodiment of a supporting member which constitutes a regulating means provided in the electrostatic latent image developing device shown in FIG.

FIG. 5 is a cross-sectional view showing another embodiment of the regulating means provided in the electrostatic latent image developing device constructed according to the present invention.

FIG. 6 is a cross-sectional view of a main part of the regulating means for explaining the force acting on the blade that constitutes the regulating means equipped in the electrostatic latent image developing device.

[Explanation of symbols]

1: rotating drum 4: Corona discharger for charging 5: Laser optics 6: Electrostatic latent image developing device 7: Transfer corona discharger 8: Corona discharger for peeling 9: Cleaning device 10: Static elimination lamp 16: developing roller 18: Supply means 20: stirring means 22: Regulatory means 26: developing roller 30: developer holding area 32: Developer regulated area 34: Development area 38: Auxiliary roller of supply means 46: Blade 47: Support member 48: Elastic biasing means 49: Holder

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akinobu Nakahata 1-228 Tamatsukuri, Chuo-ku, Osaka Mita Kogyo Co., Ltd. (72) Inventor Naoyuki Ishida 1-2-2 Tamatsukuri, Chuo-ku, Osaka Mita Kogyo Within the corporation (56) Reference JP-A-1-195474 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03G 15/08 504

Claims (2)

(57) [Claims] 1. A developing housing, and a developer for holding a developer on a surface in a developer holding area provided in the developing housing and conveying the held developer to the developing area to apply it to an electrostatic latent image. A static roller including a roller, and a regulation unit that regulates the amount of the developer retained on the surface of the developing roller in the developer regulation region located between the developer retaining region and the developing region. In the electrostatic latent image developing device, the regulating means includes a blade made of a rigid member, one surface of which is pressed against the surface of the developing roller, and the upper end of the blade is attached to both ends of the holder in line contact with each other. An electrostatic latent image developing device comprising: a supporting member that is provided; and an elastic biasing unit that presses one surface of the blade in a direction in which the blade is pressed against the surface of the developing roller. 2. A development housing, and a development for holding a developer on the surface in a developer holding area provided in the development housing and conveying the held developer to the developing area to apply it to an electrostatic latent image. A static roller including a roller, and a regulation unit that regulates the amount of the developer retained on the surface of the developing roller in the developer regulation region located between the developer retaining region and the developing region. In the electrostatic latent image developing device, the regulating means includes a blade made of a rigid member, one surface of which is pressed against the surface of the developing roller, and the upper end of the blade is attached to both ends of the holder in line contact with each other. A supporting member, elastic biasing means for pressing one surface of the blade in a direction in which the blade is pressed against the surface of the developing roller, and the supporting member is interposed between the surface of the supporting member on the pressing direction side by the elastic biasing means and the holder. Elasticity And a timber, an electrostatic latent image developing device, characterized in that.